Scraper for classifying grates



Sept. 22, 1936. KGHL R v 2,054,984

SCRAPER FOR CLASSIFYING GRATES 2 Sheets-Sheet 1 Filed Aug; 25, 1954 22, 1936-v H. KCSHLER' SCRAPER FOR CLASSIFYING GRATES Patented Sept. 22, 1936 UNITED STATES PATENT OFFICE SCRAPER FOR CLASSIFYING GRATES Application August 23, 1934, Serial No. 741,177 In Germany August 23, 1933 1 Claim.

This invention relates to scrapers for classifying grates for grading coal, ore, and the like, of the kind in which the grate surface is formed by disc cylinders arranged one behind the other.

' Such disc cylinders are either composed of sepa- 15 being forked at the lower end to slip over the beam. In order to keepthe scrapers so arranged adjacent to each other, at a distance from each other corresponding to the distance between the gaps, in the said known arrangement the 20 scrapers have lateral flanges at their forked ends,

which extend to the adjacent scrapers. Consequently all the scrapers are fixed in their working position, without being able to slide on the beam or to swing laterally. It is of great advantage to 25 make it possible for the scrapers to slide or swing a little laterally, so that they may follow the discs, when displaced, or yield for unevennesses of the discs. When scrapers are in fixed position, as in said known arrangement, a displacement or un- 30 evenness of the discs will cause a squeezing between the discs and the scrapers and therefore a greater wear of these parts and power consumption.

According to the invention the scrapers are 35 in the form of plates forked at their lower ends and each provided with a lateral flange. The scrapers are alined upon a carrier beam which is straddled by their forked lower ends, and are inserted with slight lateral play between the teeth 40 of a comb which rests upon the top of the carrier beam. The flange of each scraper extends laterally to a plane slightly spaced from the neighboring scraper, so that a slight lateral swing is permitted each scraper.

45 A mode of carrying out the invention is shown by way of example in the accompanying drawing, in which Fig. 1 is a side view, partially in section, of the scraper and a disc,

50 Fig. 2 is the corresponding view in the direction of the arrow 2: in Fig. 1,

Fig. 3 is a perspective sectional view thereof,

Fig. 4 is a front view of a part of the comb,

Fig. 5 is a cross sectional view of the comb, on 55 the line v-v of Fig. 4,

Fig. 6 is a side view of the scraper,

Fig. 7 is a section on the line VII-VII of Fig. 6, shown from the right, and

Fig. 8 is a section on the same line, shown from the left. 5

The shaft I carries the grate discs 2 which in the example shown are arranged eccentrically in relation to the axis of the shaft. The lateral distance between .the discs is determined by the spacing rings 3. Into the gap between each two 10 discs enter from below scrapers 4 which rest with their upper ends against the peripheries of the spacing rings 3.

The scrapers are of plate shape and are suitably placed singly and loosely on carrier beams 5 provided parallel to the disc cylinders, the scrapers so engaging between the teeth of the comblike bars 6, resting on the carrier beams, that a slight lateral play remains. The scrapers are each provided with a laterally projecting flange 1. In the axial direction of the disc cylinder each flange extends almost, but not quite, up to the adjacent scraper, thus leaving a slight play between the lower ends of the scrapers.

The material falling between the disc cylinders is prevented from lodging between the lower flange-bearing ends of the scrapers, but it slides down on to the obliquely inclined surface of these ends. If nevertheless a lump does form between this surface and the disc cylinder or on the flange, it is easy to force out the lump laterally or to remove it from the flange by brushes. Furthermore, the surface 8 of the flange 1 located in front in the conveying direction of the grate gives a good guidance for any means which may be used from the top, in the direction of the arrow as, to drive out any material which tends to become fixed between the fingers of the scrapers.

I claim:

In combination with the disc cylinder of a classifying grate for coal, ore, and the like; scrapers comprising fingers projecting into the spaces between the discs of the cylinder, said scrapers being forked at the lower end and having a lateral flange at said end; a beam upon which said scrapers are mounted astraddle by means of their forked ends; a comb resting on said beam and having teeth to space said scrapers apart; said scrapers being inserted between said teeth with slight play; the lateral flange of each scraper extending to a plane slightly spaced from the neighboring scraper, to allow a slight play between the lower ends of the scrapers.

HEINRICH K6HLER. 

